Branch data Line data Source code
1 : : // SPDX-License-Identifier: GPL-2.0
2 : : /*
3 : : * linux/fs/ext4/resize.c
4 : : *
5 : : * Support for resizing an ext4 filesystem while it is mounted.
6 : : *
7 : : * Copyright (C) 2001, 2002 Andreas Dilger <adilger@clusterfs.com>
8 : : *
9 : : * This could probably be made into a module, because it is not often in use.
10 : : */
11 : :
12 : :
13 : : #define EXT4FS_DEBUG
14 : :
15 : : #include <linux/errno.h>
16 : : #include <linux/slab.h>
17 : :
18 : : #include "ext4_jbd2.h"
19 : :
20 : : struct ext4_rcu_ptr {
21 : : struct rcu_head rcu;
22 : : void *ptr;
23 : : };
24 : :
25 : 0 : static void ext4_rcu_ptr_callback(struct rcu_head *head)
26 : : {
27 : 0 : struct ext4_rcu_ptr *ptr;
28 : :
29 : 0 : ptr = container_of(head, struct ext4_rcu_ptr, rcu);
30 : 0 : kvfree(ptr->ptr);
31 : 0 : kfree(ptr);
32 : 0 : }
33 : :
34 : 0 : void ext4_kvfree_array_rcu(void *to_free)
35 : : {
36 : 0 : struct ext4_rcu_ptr *ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
37 : :
38 [ # # ]: 0 : if (ptr) {
39 : 0 : ptr->ptr = to_free;
40 : 0 : call_rcu(&ptr->rcu, ext4_rcu_ptr_callback);
41 : 0 : return;
42 : : }
43 : 0 : synchronize_rcu();
44 : 0 : kvfree(to_free);
45 : : }
46 : :
47 : 0 : int ext4_resize_begin(struct super_block *sb)
48 : : {
49 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
50 : 0 : int ret = 0;
51 : :
52 [ # # ]: 0 : if (!capable(CAP_SYS_RESOURCE))
53 : : return -EPERM;
54 : :
55 : : /*
56 : : * If we are not using the primary superblock/GDT copy don't resize,
57 : : * because the user tools have no way of handling this. Probably a
58 : : * bad time to do it anyways.
59 : : */
60 : 0 : if (EXT4_B2C(sbi, sbi->s_sbh->b_blocknr) !=
61 [ # # ]: 0 : le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) {
62 : 0 : ext4_warning(sb, "won't resize using backup superblock at %llu",
63 : : (unsigned long long)EXT4_SB(sb)->s_sbh->b_blocknr);
64 : 0 : return -EPERM;
65 : : }
66 : :
67 : : /*
68 : : * We are not allowed to do online-resizing on a filesystem mounted
69 : : * with error, because it can destroy the filesystem easily.
70 : : */
71 [ # # ]: 0 : if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
72 : 0 : ext4_warning(sb, "There are errors in the filesystem, "
73 : : "so online resizing is not allowed");
74 : 0 : return -EPERM;
75 : : }
76 : :
77 [ # # ]: 0 : if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
78 : 0 : &EXT4_SB(sb)->s_ext4_flags))
79 : 0 : ret = -EBUSY;
80 : :
81 : : return ret;
82 : : }
83 : :
84 : 0 : void ext4_resize_end(struct super_block *sb)
85 : : {
86 : 0 : clear_bit_unlock(EXT4_FLAGS_RESIZING, &EXT4_SB(sb)->s_ext4_flags);
87 : 0 : smp_mb__after_atomic();
88 : 0 : }
89 : :
90 : 0 : static ext4_group_t ext4_meta_bg_first_group(struct super_block *sb,
91 : : ext4_group_t group) {
92 : 0 : return (group >> EXT4_DESC_PER_BLOCK_BITS(sb)) <<
93 : : EXT4_DESC_PER_BLOCK_BITS(sb);
94 : : }
95 : :
96 : 0 : static ext4_fsblk_t ext4_meta_bg_first_block_no(struct super_block *sb,
97 : : ext4_group_t group) {
98 : 0 : group = ext4_meta_bg_first_group(sb, group);
99 : 0 : return ext4_group_first_block_no(sb, group);
100 : : }
101 : :
102 : 0 : static ext4_grpblk_t ext4_group_overhead_blocks(struct super_block *sb,
103 : : ext4_group_t group) {
104 : 0 : ext4_grpblk_t overhead;
105 : 0 : overhead = ext4_bg_num_gdb(sb, group);
106 [ # # ]: 0 : if (ext4_bg_has_super(sb, group))
107 : 0 : overhead += 1 +
108 : 0 : le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
109 : 0 : return overhead;
110 : : }
111 : :
112 : : #define outside(b, first, last) ((b) < (first) || (b) >= (last))
113 : : #define inside(b, first, last) ((b) >= (first) && (b) < (last))
114 : :
115 : 0 : static int verify_group_input(struct super_block *sb,
116 : : struct ext4_new_group_data *input)
117 : : {
118 [ # # ]: 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
119 : 0 : struct ext4_super_block *es = sbi->s_es;
120 [ # # ]: 0 : ext4_fsblk_t start = ext4_blocks_count(es);
121 : 0 : ext4_fsblk_t end = start + input->blocks_count;
122 : 0 : ext4_group_t group = input->group;
123 : 0 : ext4_fsblk_t itend = input->inode_table + sbi->s_itb_per_group;
124 : 0 : unsigned overhead;
125 : 0 : ext4_fsblk_t metaend;
126 : 0 : struct buffer_head *bh = NULL;
127 : 0 : ext4_grpblk_t free_blocks_count, offset;
128 : 0 : int err = -EINVAL;
129 : :
130 [ # # ]: 0 : if (group != sbi->s_groups_count) {
131 : 0 : ext4_warning(sb, "Cannot add at group %u (only %u groups)",
132 : : input->group, sbi->s_groups_count);
133 : 0 : return -EINVAL;
134 : : }
135 : :
136 : 0 : overhead = ext4_group_overhead_blocks(sb, group);
137 : 0 : metaend = start + overhead;
138 : 0 : input->free_clusters_count = free_blocks_count =
139 : 0 : input->blocks_count - 2 - overhead - sbi->s_itb_per_group;
140 : :
141 [ # # ]: 0 : if (test_opt(sb, DEBUG))
142 [ # # ]: 0 : printk(KERN_DEBUG "EXT4-fs: adding %s group %u: %u blocks "
143 : : "(%d free, %u reserved)\n",
144 : 0 : ext4_bg_has_super(sb, input->group) ? "normal" :
145 : : "no-super", input->group, input->blocks_count,
146 : 0 : free_blocks_count, input->reserved_blocks);
147 : :
148 : 0 : ext4_get_group_no_and_offset(sb, start, NULL, &offset);
149 [ # # ]: 0 : if (offset != 0)
150 : 0 : ext4_warning(sb, "Last group not full");
151 [ # # ]: 0 : else if (input->reserved_blocks > input->blocks_count / 5)
152 : 0 : ext4_warning(sb, "Reserved blocks too high (%u)",
153 : : input->reserved_blocks);
154 [ # # ]: 0 : else if (free_blocks_count < 0)
155 : 0 : ext4_warning(sb, "Bad blocks count %u",
156 : : input->blocks_count);
157 [ # # ]: 0 : else if (IS_ERR(bh = ext4_sb_bread(sb, end - 1, 0))) {
158 : 0 : err = PTR_ERR(bh);
159 : 0 : bh = NULL;
160 : 0 : ext4_warning(sb, "Cannot read last block (%llu)",
161 : : end - 1);
162 [ # # # # ]: 0 : } else if (outside(input->block_bitmap, start, end))
163 : 0 : ext4_warning(sb, "Block bitmap not in group (block %llu)",
164 : : (unsigned long long)input->block_bitmap);
165 [ # # # # ]: 0 : else if (outside(input->inode_bitmap, start, end))
166 : 0 : ext4_warning(sb, "Inode bitmap not in group (block %llu)",
167 : : (unsigned long long)input->inode_bitmap);
168 [ # # # # ]: 0 : else if (outside(input->inode_table, start, end) ||
169 [ # # # # ]: 0 : outside(itend - 1, start, end))
170 : 0 : ext4_warning(sb, "Inode table not in group (blocks %llu-%llu)",
171 : : (unsigned long long)input->inode_table, itend - 1);
172 [ # # ]: 0 : else if (input->inode_bitmap == input->block_bitmap)
173 : 0 : ext4_warning(sb, "Block bitmap same as inode bitmap (%llu)",
174 : : (unsigned long long)input->block_bitmap);
175 [ # # # # ]: 0 : else if (inside(input->block_bitmap, input->inode_table, itend))
176 : 0 : ext4_warning(sb, "Block bitmap (%llu) in inode table "
177 : : "(%llu-%llu)",
178 : : (unsigned long long)input->block_bitmap,
179 : : (unsigned long long)input->inode_table, itend - 1);
180 [ # # # # ]: 0 : else if (inside(input->inode_bitmap, input->inode_table, itend))
181 : 0 : ext4_warning(sb, "Inode bitmap (%llu) in inode table "
182 : : "(%llu-%llu)",
183 : : (unsigned long long)input->inode_bitmap,
184 : : (unsigned long long)input->inode_table, itend - 1);
185 [ # # ]: 0 : else if (inside(input->block_bitmap, start, metaend))
186 : 0 : ext4_warning(sb, "Block bitmap (%llu) in GDT table (%llu-%llu)",
187 : : (unsigned long long)input->block_bitmap,
188 : : start, metaend - 1);
189 [ # # ]: 0 : else if (inside(input->inode_bitmap, start, metaend))
190 : 0 : ext4_warning(sb, "Inode bitmap (%llu) in GDT table (%llu-%llu)",
191 : : (unsigned long long)input->inode_bitmap,
192 : : start, metaend - 1);
193 [ # # ]: 0 : else if (inside(input->inode_table, start, metaend) ||
194 [ # # ]: 0 : inside(itend - 1, start, metaend))
195 : 0 : ext4_warning(sb, "Inode table (%llu-%llu) overlaps GDT table "
196 : : "(%llu-%llu)",
197 : : (unsigned long long)input->inode_table,
198 : : itend - 1, start, metaend - 1);
199 : : else
200 : : err = 0;
201 [ # # ]: 0 : brelse(bh);
202 : :
203 : : return err;
204 : : }
205 : :
206 : : /*
207 : : * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex
208 : : * group each time.
209 : : */
210 : : struct ext4_new_flex_group_data {
211 : : struct ext4_new_group_data *groups; /* new_group_data for groups
212 : : in the flex group */
213 : : __u16 *bg_flags; /* block group flags of groups
214 : : in @groups */
215 : : ext4_group_t count; /* number of groups in @groups
216 : : */
217 : : };
218 : :
219 : : /*
220 : : * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of
221 : : * @flexbg_size.
222 : : *
223 : : * Returns NULL on failure otherwise address of the allocated structure.
224 : : */
225 : 0 : static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
226 : : {
227 : 0 : struct ext4_new_flex_group_data *flex_gd;
228 : :
229 : 0 : flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
230 [ # # ]: 0 : if (flex_gd == NULL)
231 : 0 : goto out3;
232 : :
233 [ # # ]: 0 : if (flexbg_size >= UINT_MAX / sizeof(struct ext4_new_group_data))
234 : 0 : goto out2;
235 : 0 : flex_gd->count = flexbg_size;
236 : :
237 : 0 : flex_gd->groups = kmalloc_array(flexbg_size,
238 : : sizeof(struct ext4_new_group_data),
239 : : GFP_NOFS);
240 [ # # ]: 0 : if (flex_gd->groups == NULL)
241 : 0 : goto out2;
242 : :
243 : 0 : flex_gd->bg_flags = kmalloc_array(flexbg_size, sizeof(__u16),
244 : : GFP_NOFS);
245 [ # # ]: 0 : if (flex_gd->bg_flags == NULL)
246 : 0 : goto out1;
247 : :
248 : : return flex_gd;
249 : :
250 : : out1:
251 : 0 : kfree(flex_gd->groups);
252 : 0 : out2:
253 : 0 : kfree(flex_gd);
254 : : out3:
255 : : return NULL;
256 : : }
257 : :
258 : 0 : static void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
259 : : {
260 : 0 : kfree(flex_gd->bg_flags);
261 : 0 : kfree(flex_gd->groups);
262 : 0 : kfree(flex_gd);
263 : 0 : }
264 : :
265 : : /*
266 : : * ext4_alloc_group_tables() allocates block bitmaps, inode bitmaps
267 : : * and inode tables for a flex group.
268 : : *
269 : : * This function is used by 64bit-resize. Note that this function allocates
270 : : * group tables from the 1st group of groups contained by @flexgd, which may
271 : : * be a partial of a flex group.
272 : : *
273 : : * @sb: super block of fs to which the groups belongs
274 : : *
275 : : * Returns 0 on a successful allocation of the metadata blocks in the
276 : : * block group.
277 : : */
278 : 0 : static int ext4_alloc_group_tables(struct super_block *sb,
279 : : struct ext4_new_flex_group_data *flex_gd,
280 : : int flexbg_size)
281 : : {
282 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
283 : 0 : ext4_fsblk_t start_blk;
284 : 0 : ext4_fsblk_t last_blk;
285 : 0 : ext4_group_t src_group;
286 : 0 : ext4_group_t bb_index = 0;
287 : 0 : ext4_group_t ib_index = 0;
288 : 0 : ext4_group_t it_index = 0;
289 : 0 : ext4_group_t group;
290 : 0 : ext4_group_t last_group;
291 : 0 : unsigned overhead;
292 [ # # ]: 0 : __u16 uninit_mask = (flexbg_size > 1) ? ~EXT4_BG_BLOCK_UNINIT : ~0;
293 : 0 : int i;
294 : :
295 [ # # # # ]: 0 : BUG_ON(flex_gd->count == 0 || group_data == NULL);
296 : :
297 : 0 : src_group = group_data[0].group;
298 : 0 : last_group = src_group + flex_gd->count - 1;
299 : :
300 [ # # # # ]: 0 : BUG_ON((flexbg_size > 1) && ((src_group & ~(flexbg_size - 1)) !=
301 : : (last_group & ~(flexbg_size - 1))));
302 : 0 : next_group:
303 : 0 : group = group_data[0].group;
304 [ # # ]: 0 : if (src_group >= group_data[0].group + flex_gd->count)
305 : : return -ENOSPC;
306 : 0 : start_blk = ext4_group_first_block_no(sb, src_group);
307 : 0 : last_blk = start_blk + group_data[src_group - group].blocks_count;
308 : :
309 : 0 : overhead = ext4_group_overhead_blocks(sb, src_group);
310 : :
311 : 0 : start_blk += overhead;
312 : :
313 : : /* We collect contiguous blocks as much as possible. */
314 : 0 : src_group++;
315 [ # # ]: 0 : for (; src_group <= last_group; src_group++) {
316 : 0 : overhead = ext4_group_overhead_blocks(sb, src_group);
317 [ # # ]: 0 : if (overhead == 0)
318 : 0 : last_blk += group_data[src_group - group].blocks_count;
319 : : else
320 : : break;
321 : : }
322 : :
323 : : /* Allocate block bitmaps */
324 [ # # ]: 0 : for (; bb_index < flex_gd->count; bb_index++) {
325 [ # # ]: 0 : if (start_blk >= last_blk)
326 : 0 : goto next_group;
327 : 0 : group_data[bb_index].block_bitmap = start_blk++;
328 : 0 : group = ext4_get_group_number(sb, start_blk - 1);
329 : 0 : group -= group_data[0].group;
330 : 0 : group_data[group].mdata_blocks++;
331 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
332 : : }
333 : :
334 : : /* Allocate inode bitmaps */
335 [ # # ]: 0 : for (; ib_index < flex_gd->count; ib_index++) {
336 [ # # ]: 0 : if (start_blk >= last_blk)
337 : 0 : goto next_group;
338 : 0 : group_data[ib_index].inode_bitmap = start_blk++;
339 : 0 : group = ext4_get_group_number(sb, start_blk - 1);
340 : 0 : group -= group_data[0].group;
341 : 0 : group_data[group].mdata_blocks++;
342 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
343 : : }
344 : :
345 : : /* Allocate inode tables */
346 [ # # ]: 0 : for (; it_index < flex_gd->count; it_index++) {
347 [ # # ]: 0 : unsigned int itb = EXT4_SB(sb)->s_itb_per_group;
348 : 0 : ext4_fsblk_t next_group_start;
349 : :
350 [ # # ]: 0 : if (start_blk + itb > last_blk)
351 : 0 : goto next_group;
352 : 0 : group_data[it_index].inode_table = start_blk;
353 : 0 : group = ext4_get_group_number(sb, start_blk);
354 [ # # ]: 0 : next_group_start = ext4_group_first_block_no(sb, group + 1);
355 : 0 : group -= group_data[0].group;
356 : :
357 [ # # ]: 0 : if (start_blk + itb > next_group_start) {
358 : 0 : flex_gd->bg_flags[group + 1] &= uninit_mask;
359 : 0 : overhead = start_blk + itb - next_group_start;
360 : 0 : group_data[group + 1].mdata_blocks += overhead;
361 : 0 : itb -= overhead;
362 : : }
363 : :
364 : 0 : group_data[group].mdata_blocks += itb;
365 : 0 : flex_gd->bg_flags[group] &= uninit_mask;
366 : 0 : start_blk += EXT4_SB(sb)->s_itb_per_group;
367 : : }
368 : :
369 : : /* Update free clusters count to exclude metadata blocks */
370 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
371 : 0 : group_data[i].free_clusters_count -=
372 : 0 : EXT4_NUM_B2C(EXT4_SB(sb),
373 : : group_data[i].mdata_blocks);
374 : : }
375 : :
376 [ # # ]: 0 : if (test_opt(sb, DEBUG)) {
377 : 0 : int i;
378 : 0 : group = group_data[0].group;
379 : :
380 : 0 : printk(KERN_DEBUG "EXT4-fs: adding a flex group with "
381 : : "%d groups, flexbg size is %d:\n", flex_gd->count,
382 : : flexbg_size);
383 : :
384 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
385 : 0 : ext4_debug(
386 : : "adding %s group %u: %u blocks (%d free, %d mdata blocks)\n",
387 : : ext4_bg_has_super(sb, group + i) ? "normal" :
388 : : "no-super", group + i,
389 : : group_data[i].blocks_count,
390 : : group_data[i].free_clusters_count,
391 : : group_data[i].mdata_blocks);
392 : : }
393 : : }
394 : : return 0;
395 : : }
396 : :
397 : 0 : static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
398 : : ext4_fsblk_t blk)
399 : : {
400 : 0 : struct buffer_head *bh;
401 : 0 : int err;
402 : :
403 : 0 : bh = sb_getblk(sb, blk);
404 [ # # ]: 0 : if (unlikely(!bh))
405 : : return ERR_PTR(-ENOMEM);
406 : 0 : BUFFER_TRACE(bh, "get_write_access");
407 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, bh))) {
408 [ # # ]: 0 : brelse(bh);
409 : 0 : bh = ERR_PTR(err);
410 : : } else {
411 : 0 : memset(bh->b_data, 0, sb->s_blocksize);
412 : 0 : set_buffer_uptodate(bh);
413 : : }
414 : :
415 : : return bh;
416 : : }
417 : :
418 : 0 : static int ext4_resize_ensure_credits_batch(handle_t *handle, int credits)
419 : : {
420 [ # # # # : 0 : return ext4_journal_ensure_credits_fn(handle, credits,
# # ]
421 : : EXT4_MAX_TRANS_DATA, 0, 0);
422 : : }
423 : :
424 : : /*
425 : : * set_flexbg_block_bitmap() mark clusters [@first_cluster, @last_cluster] used.
426 : : *
427 : : * Helper function for ext4_setup_new_group_blocks() which set .
428 : : *
429 : : * @sb: super block
430 : : * @handle: journal handle
431 : : * @flex_gd: flex group data
432 : : */
433 : 0 : static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
434 : : struct ext4_new_flex_group_data *flex_gd,
435 : : ext4_fsblk_t first_cluster, ext4_fsblk_t last_cluster)
436 : : {
437 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
438 : 0 : ext4_group_t count = last_cluster - first_cluster + 1;
439 : 0 : ext4_group_t count2;
440 : :
441 : 0 : ext4_debug("mark clusters [%llu-%llu] used\n", first_cluster,
442 : : last_cluster);
443 [ # # ]: 0 : for (count2 = count; count > 0;
444 : 0 : count -= count2, first_cluster += count2) {
445 : 0 : ext4_fsblk_t start;
446 : 0 : struct buffer_head *bh;
447 : 0 : ext4_group_t group;
448 : 0 : int err;
449 : :
450 : 0 : group = ext4_get_group_number(sb, EXT4_C2B(sbi, first_cluster));
451 [ # # ]: 0 : start = EXT4_B2C(sbi, ext4_group_first_block_no(sb, group));
452 : 0 : group -= flex_gd->groups[0].group;
453 : :
454 : 0 : count2 = EXT4_CLUSTERS_PER_GROUP(sb) - (first_cluster - start);
455 : 0 : if (count2 > count)
456 : : count2 = count;
457 : :
458 [ # # ]: 0 : if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
459 [ # # ]: 0 : BUG_ON(flex_gd->count > 1);
460 : 0 : continue;
461 : : }
462 : :
463 : 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
464 [ # # ]: 0 : if (err < 0)
465 : 0 : return err;
466 : :
467 : 0 : bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
468 [ # # ]: 0 : if (unlikely(!bh))
469 : : return -ENOMEM;
470 : :
471 : 0 : BUFFER_TRACE(bh, "get_write_access");
472 : 0 : err = ext4_journal_get_write_access(handle, bh);
473 [ # # ]: 0 : if (err) {
474 [ # # ]: 0 : brelse(bh);
475 : 0 : return err;
476 : : }
477 : 0 : ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n",
478 : : first_cluster, first_cluster - start, count2);
479 : 0 : ext4_set_bits(bh->b_data, first_cluster - start, count2);
480 : :
481 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
482 [ # # ]: 0 : brelse(bh);
483 [ # # ]: 0 : if (unlikely(err))
484 : 0 : return err;
485 : : }
486 : :
487 : : return 0;
488 : : }
489 : :
490 : : /*
491 : : * Set up the block and inode bitmaps, and the inode table for the new groups.
492 : : * This doesn't need to be part of the main transaction, since we are only
493 : : * changing blocks outside the actual filesystem. We still do journaling to
494 : : * ensure the recovery is correct in case of a failure just after resize.
495 : : * If any part of this fails, we simply abort the resize.
496 : : *
497 : : * setup_new_flex_group_blocks handles a flex group as follow:
498 : : * 1. copy super block and GDT, and initialize group tables if necessary.
499 : : * In this step, we only set bits in blocks bitmaps for blocks taken by
500 : : * super block and GDT.
501 : : * 2. allocate group tables in block bitmaps, that is, set bits in block
502 : : * bitmap for blocks taken by group tables.
503 : : */
504 : 0 : static int setup_new_flex_group_blocks(struct super_block *sb,
505 : : struct ext4_new_flex_group_data *flex_gd)
506 : : {
507 [ # # ]: 0 : int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
508 : 0 : ext4_fsblk_t start;
509 : 0 : ext4_fsblk_t block;
510 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
511 : 0 : struct ext4_super_block *es = sbi->s_es;
512 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
513 : 0 : __u16 *bg_flags = flex_gd->bg_flags;
514 : 0 : handle_t *handle;
515 : 0 : ext4_group_t group, count;
516 : 0 : struct buffer_head *bh = NULL;
517 : 0 : int reserved_gdb, i, j, err = 0, err2;
518 : 0 : int meta_bg;
519 : :
520 [ # # # # : 0 : BUG_ON(!flex_gd->count || !group_data ||
# # ]
521 : : group_data[0].group != sbi->s_groups_count);
522 : :
523 : 0 : reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
524 : 0 : meta_bg = ext4_has_feature_meta_bg(sb);
525 : :
526 : : /* This transaction may be extended/restarted along the way */
527 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
528 [ # # ]: 0 : if (IS_ERR(handle))
529 : 0 : return PTR_ERR(handle);
530 : :
531 : 0 : group = group_data[0].group;
532 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++, group++) {
533 : 0 : unsigned long gdblocks;
534 : 0 : ext4_grpblk_t overhead;
535 : :
536 : 0 : gdblocks = ext4_bg_num_gdb(sb, group);
537 [ # # ]: 0 : start = ext4_group_first_block_no(sb, group);
538 : :
539 [ # # # # ]: 0 : if (meta_bg == 0 && !ext4_bg_has_super(sb, group))
540 : 0 : goto handle_itb;
541 : :
542 [ # # ]: 0 : if (meta_bg == 1) {
543 : 0 : ext4_group_t first_group;
544 [ # # ]: 0 : first_group = ext4_meta_bg_first_group(sb, group);
545 [ # # # # ]: 0 : if (first_group != group + 1 &&
546 [ # # ]: 0 : first_group != group + EXT4_DESC_PER_BLOCK(sb) - 1)
547 : 0 : goto handle_itb;
548 : : }
549 : :
550 : 0 : block = start + ext4_bg_has_super(sb, group);
551 : : /* Copy all of the GDT blocks into the backup in this group */
552 [ # # ]: 0 : for (j = 0; j < gdblocks; j++, block++) {
553 : 0 : struct buffer_head *gdb;
554 : :
555 : 0 : ext4_debug("update backup group %#04llx\n", block);
556 : 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
557 [ # # ]: 0 : if (err < 0)
558 : 0 : goto out;
559 : :
560 : 0 : gdb = sb_getblk(sb, block);
561 [ # # ]: 0 : if (unlikely(!gdb)) {
562 : 0 : err = -ENOMEM;
563 : 0 : goto out;
564 : : }
565 : :
566 : 0 : BUFFER_TRACE(gdb, "get_write_access");
567 : 0 : err = ext4_journal_get_write_access(handle, gdb);
568 [ # # ]: 0 : if (err) {
569 [ # # ]: 0 : brelse(gdb);
570 : 0 : goto out;
571 : : }
572 : 0 : memcpy(gdb->b_data, sbi_array_rcu_deref(sbi,
573 : 0 : s_group_desc, j)->b_data, gdb->b_size);
574 : 0 : set_buffer_uptodate(gdb);
575 : :
576 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb);
577 [ # # ]: 0 : if (unlikely(err)) {
578 [ # # ]: 0 : brelse(gdb);
579 : 0 : goto out;
580 : : }
581 [ # # ]: 0 : brelse(gdb);
582 : : }
583 : :
584 : : /* Zero out all of the reserved backup group descriptor
585 : : * table blocks
586 : : */
587 [ # # ]: 0 : if (ext4_bg_has_super(sb, group)) {
588 : 0 : err = sb_issue_zeroout(sb, gdblocks + start + 1,
589 : : reserved_gdb, GFP_NOFS);
590 [ # # ]: 0 : if (err)
591 : 0 : goto out;
592 : : }
593 : :
594 : 0 : handle_itb:
595 : : /* Initialize group tables of the grop @group */
596 [ # # ]: 0 : if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
597 : 0 : goto handle_bb;
598 : :
599 : : /* Zero out all of the inode table blocks */
600 : 0 : block = group_data[i].inode_table;
601 : 0 : ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
602 : : block, sbi->s_itb_per_group);
603 : 0 : err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
604 : : GFP_NOFS);
605 [ # # ]: 0 : if (err)
606 : 0 : goto out;
607 : :
608 : 0 : handle_bb:
609 [ # # ]: 0 : if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
610 : 0 : goto handle_ib;
611 : :
612 : : /* Initialize block bitmap of the @group */
613 : 0 : block = group_data[i].block_bitmap;
614 : 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
615 [ # # ]: 0 : if (err < 0)
616 : 0 : goto out;
617 : :
618 : 0 : bh = bclean(handle, sb, block);
619 [ # # ]: 0 : if (IS_ERR(bh)) {
620 : 0 : err = PTR_ERR(bh);
621 : 0 : goto out;
622 : : }
623 : 0 : overhead = ext4_group_overhead_blocks(sb, group);
624 [ # # ]: 0 : if (overhead != 0) {
625 : 0 : ext4_debug("mark backup superblock %#04llx (+0)\n",
626 : : start);
627 : 0 : ext4_set_bits(bh->b_data, 0,
628 : 0 : EXT4_NUM_B2C(sbi, overhead));
629 : : }
630 : 0 : ext4_mark_bitmap_end(EXT4_B2C(sbi, group_data[i].blocks_count),
631 : 0 : sb->s_blocksize * 8, bh->b_data);
632 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
633 [ # # ]: 0 : brelse(bh);
634 [ # # ]: 0 : if (err)
635 : 0 : goto out;
636 : :
637 : 0 : handle_ib:
638 [ # # ]: 0 : if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
639 : 0 : continue;
640 : :
641 : : /* Initialize inode bitmap of the @group */
642 : 0 : block = group_data[i].inode_bitmap;
643 : 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
644 [ # # ]: 0 : if (err < 0)
645 : 0 : goto out;
646 : : /* Mark unused entries in inode bitmap used */
647 : 0 : bh = bclean(handle, sb, block);
648 [ # # ]: 0 : if (IS_ERR(bh)) {
649 : 0 : err = PTR_ERR(bh);
650 : 0 : goto out;
651 : : }
652 : :
653 : 0 : ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
654 : 0 : sb->s_blocksize * 8, bh->b_data);
655 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
656 [ # # ]: 0 : brelse(bh);
657 [ # # ]: 0 : if (err)
658 : 0 : goto out;
659 : : }
660 : :
661 : : /* Mark group tables in block bitmap */
662 [ # # ]: 0 : for (j = 0; j < GROUP_TABLE_COUNT; j++) {
663 : 0 : count = group_table_count[j];
664 : 0 : start = (&group_data[0].block_bitmap)[j];
665 : 0 : block = start;
666 [ # # ]: 0 : for (i = 1; i < flex_gd->count; i++) {
667 : 0 : block += group_table_count[j];
668 [ # # ]: 0 : if (block == (&group_data[i].block_bitmap)[j]) {
669 : 0 : count += group_table_count[j];
670 : 0 : continue;
671 : : }
672 : 0 : err = set_flexbg_block_bitmap(sb, handle,
673 : : flex_gd,
674 : : EXT4_B2C(sbi, start),
675 : 0 : EXT4_B2C(sbi,
676 : : start + count
677 : : - 1));
678 [ # # ]: 0 : if (err)
679 : 0 : goto out;
680 : 0 : count = group_table_count[j];
681 : 0 : start = (&group_data[i].block_bitmap)[j];
682 : 0 : block = start;
683 : : }
684 : :
685 [ # # ]: 0 : if (count) {
686 : 0 : err = set_flexbg_block_bitmap(sb, handle,
687 : : flex_gd,
688 : : EXT4_B2C(sbi, start),
689 : 0 : EXT4_B2C(sbi,
690 : : start + count
691 : : - 1));
692 [ # # ]: 0 : if (err)
693 : 0 : goto out;
694 : : }
695 : : }
696 : :
697 : 0 : out:
698 : 0 : err2 = ext4_journal_stop(handle);
699 [ # # ]: 0 : if (err2 && !err)
700 : 0 : err = err2;
701 : :
702 : : return err;
703 : : }
704 : :
705 : : /*
706 : : * Iterate through the groups which hold BACKUP superblock/GDT copies in an
707 : : * ext4 filesystem. The counters should be initialized to 1, 5, and 7 before
708 : : * calling this for the first time. In a sparse filesystem it will be the
709 : : * sequence of powers of 3, 5, and 7: 1, 3, 5, 7, 9, 25, 27, 49, 81, ...
710 : : * For a non-sparse filesystem it will be every group: 1, 2, 3, 4, ...
711 : : */
712 : 0 : static unsigned ext4_list_backups(struct super_block *sb, unsigned *three,
713 : : unsigned *five, unsigned *seven)
714 : : {
715 : 0 : unsigned *min = three;
716 : 0 : int mult = 3;
717 : 0 : unsigned ret;
718 : :
719 : 0 : if (!ext4_has_feature_sparse_super(sb)) {
720 : 0 : ret = *min;
721 : 0 : *min += 1;
722 : 0 : return ret;
723 : : }
724 : :
725 [ # # # # ]: 0 : if (*five < *min) {
726 : 0 : min = five;
727 : 0 : mult = 5;
728 : : }
729 [ # # # # ]: 0 : if (*seven < *min) {
730 : 0 : min = seven;
731 : 0 : mult = 7;
732 : : }
733 : :
734 : 0 : ret = *min;
735 : 0 : *min *= mult;
736 : :
737 : 0 : return ret;
738 : : }
739 : :
740 : : /*
741 : : * Check that all of the backup GDT blocks are held in the primary GDT block.
742 : : * It is assumed that they are stored in group order. Returns the number of
743 : : * groups in current filesystem that have BACKUPS, or -ve error code.
744 : : */
745 : : static int verify_reserved_gdb(struct super_block *sb,
746 : : ext4_group_t end,
747 : : struct buffer_head *primary)
748 : : {
749 : : const ext4_fsblk_t blk = primary->b_blocknr;
750 : : unsigned three = 1;
751 : : unsigned five = 5;
752 : : unsigned seven = 7;
753 : : unsigned grp;
754 : : __le32 *p = (__le32 *)primary->b_data;
755 : : int gdbackups = 0;
756 : :
757 : : while ((grp = ext4_list_backups(sb, &three, &five, &seven)) < end) {
758 : : if (le32_to_cpu(*p++) !=
759 : : grp * EXT4_BLOCKS_PER_GROUP(sb) + blk){
760 : : ext4_warning(sb, "reserved GDT %llu"
761 : : " missing grp %d (%llu)",
762 : : blk, grp,
763 : : grp *
764 : : (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
765 : : blk);
766 : : return -EINVAL;
767 : : }
768 : : if (++gdbackups > EXT4_ADDR_PER_BLOCK(sb))
769 : : return -EFBIG;
770 : : }
771 : :
772 : : return gdbackups;
773 : : }
774 : :
775 : : /*
776 : : * Called when we need to bring a reserved group descriptor table block into
777 : : * use from the resize inode. The primary copy of the new GDT block currently
778 : : * is an indirect block (under the double indirect block in the resize inode).
779 : : * The new backup GDT blocks will be stored as leaf blocks in this indirect
780 : : * block, in group order. Even though we know all the block numbers we need,
781 : : * we check to ensure that the resize inode has actually reserved these blocks.
782 : : *
783 : : * Don't need to update the block bitmaps because the blocks are still in use.
784 : : *
785 : : * We get all of the error cases out of the way, so that we are sure to not
786 : : * fail once we start modifying the data on disk, because JBD has no rollback.
787 : : */
788 : 0 : static int add_new_gdb(handle_t *handle, struct inode *inode,
789 : : ext4_group_t group)
790 : : {
791 : 0 : struct super_block *sb = inode->i_sb;
792 [ # # ]: 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
793 : 0 : unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
794 : 0 : ext4_fsblk_t gdblock = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + gdb_num;
795 : 0 : struct buffer_head **o_group_desc, **n_group_desc = NULL;
796 : 0 : struct buffer_head *dind = NULL;
797 : 0 : struct buffer_head *gdb_bh = NULL;
798 : 0 : int gdbackups;
799 : 0 : struct ext4_iloc iloc = { .bh = NULL };
800 : 0 : __le32 *data;
801 : 0 : int err;
802 : :
803 [ # # ]: 0 : if (test_opt(sb, DEBUG))
804 : 0 : printk(KERN_DEBUG
805 : : "EXT4-fs: ext4_add_new_gdb: adding group block %lu\n",
806 : : gdb_num);
807 : :
808 : 0 : gdb_bh = ext4_sb_bread(sb, gdblock, 0);
809 [ # # ]: 0 : if (IS_ERR(gdb_bh))
810 : 0 : return PTR_ERR(gdb_bh);
811 : :
812 : 0 : gdbackups = verify_reserved_gdb(sb, group, gdb_bh);
813 [ # # ]: 0 : if (gdbackups < 0) {
814 : 0 : err = gdbackups;
815 : 0 : goto errout;
816 : : }
817 : :
818 : 0 : data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
819 : 0 : dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0);
820 [ # # ]: 0 : if (IS_ERR(dind)) {
821 : 0 : err = PTR_ERR(dind);
822 : 0 : dind = NULL;
823 : 0 : goto errout;
824 : : }
825 : :
826 : 0 : data = (__le32 *)dind->b_data;
827 [ # # ]: 0 : if (le32_to_cpu(data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)]) != gdblock) {
828 : 0 : ext4_warning(sb, "new group %u GDT block %llu not reserved",
829 : : group, gdblock);
830 : 0 : err = -EINVAL;
831 : 0 : goto errout;
832 : : }
833 : :
834 : 0 : BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
835 : 0 : err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
836 [ # # ]: 0 : if (unlikely(err))
837 : 0 : goto errout;
838 : :
839 : 0 : BUFFER_TRACE(gdb_bh, "get_write_access");
840 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
841 [ # # ]: 0 : if (unlikely(err))
842 : 0 : goto errout;
843 : :
844 : 0 : BUFFER_TRACE(dind, "get_write_access");
845 : 0 : err = ext4_journal_get_write_access(handle, dind);
846 [ # # ]: 0 : if (unlikely(err))
847 [ # # ]: 0 : ext4_std_error(sb, err);
848 : :
849 : : /* ext4_reserve_inode_write() gets a reference on the iloc */
850 : 0 : err = ext4_reserve_inode_write(handle, inode, &iloc);
851 [ # # ]: 0 : if (unlikely(err))
852 : 0 : goto errout;
853 : :
854 : 0 : n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *),
855 : : GFP_KERNEL);
856 [ # # ]: 0 : if (!n_group_desc) {
857 : 0 : err = -ENOMEM;
858 : 0 : ext4_warning(sb, "not enough memory for %lu groups",
859 : : gdb_num + 1);
860 : 0 : goto errout;
861 : : }
862 : :
863 : : /*
864 : : * Finally, we have all of the possible failures behind us...
865 : : *
866 : : * Remove new GDT block from inode double-indirect block and clear out
867 : : * the new GDT block for use (which also "frees" the backup GDT blocks
868 : : * from the reserved inode). We don't need to change the bitmaps for
869 : : * these blocks, because they are marked as in-use from being in the
870 : : * reserved inode, and will become GDT blocks (primary and backup).
871 : : */
872 : 0 : data[gdb_num % EXT4_ADDR_PER_BLOCK(sb)] = 0;
873 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, dind);
874 [ # # ]: 0 : if (unlikely(err)) {
875 [ # # ]: 0 : ext4_std_error(sb, err);
876 : 0 : goto errout;
877 : : }
878 : 0 : inode->i_blocks -= (gdbackups + 1) * sb->s_blocksize >>
879 : 0 : (9 - EXT4_SB(sb)->s_cluster_bits);
880 : 0 : ext4_mark_iloc_dirty(handle, inode, &iloc);
881 : 0 : memset(gdb_bh->b_data, 0, sb->s_blocksize);
882 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
883 [ # # ]: 0 : if (unlikely(err)) {
884 [ # # ]: 0 : ext4_std_error(sb, err);
885 : 0 : iloc.bh = NULL;
886 : 0 : goto errout;
887 : : }
888 [ # # ]: 0 : brelse(dind);
889 : :
890 : 0 : rcu_read_lock();
891 : 0 : o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc);
892 : 0 : memcpy(n_group_desc, o_group_desc,
893 : 0 : EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
894 : 0 : rcu_read_unlock();
895 : 0 : n_group_desc[gdb_num] = gdb_bh;
896 : 0 : rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc);
897 : 0 : EXT4_SB(sb)->s_gdb_count++;
898 : 0 : ext4_kvfree_array_rcu(o_group_desc);
899 : :
900 : 0 : le16_add_cpu(&es->s_reserved_gdt_blocks, -1);
901 : 0 : err = ext4_handle_dirty_super(handle, sb);
902 [ # # ]: 0 : if (err)
903 : 0 : ext4_std_error(sb, err);
904 : : return err;
905 : 0 : errout:
906 : 0 : kvfree(n_group_desc);
907 [ # # ]: 0 : brelse(iloc.bh);
908 [ # # ]: 0 : brelse(dind);
909 [ # # ]: 0 : brelse(gdb_bh);
910 : :
911 : : ext4_debug("leaving with error %d\n", err);
912 : : return err;
913 : : }
914 : :
915 : : /*
916 : : * add_new_gdb_meta_bg is the sister of add_new_gdb.
917 : : */
918 : 0 : static int add_new_gdb_meta_bg(struct super_block *sb,
919 : : handle_t *handle, ext4_group_t group) {
920 : 0 : ext4_fsblk_t gdblock;
921 : 0 : struct buffer_head *gdb_bh;
922 : 0 : struct buffer_head **o_group_desc, **n_group_desc;
923 : 0 : unsigned long gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
924 : 0 : int err;
925 : :
926 : 0 : gdblock = ext4_meta_bg_first_block_no(sb, group) +
927 : 0 : ext4_bg_has_super(sb, group);
928 : 0 : gdb_bh = ext4_sb_bread(sb, gdblock, 0);
929 [ # # ]: 0 : if (IS_ERR(gdb_bh))
930 : 0 : return PTR_ERR(gdb_bh);
931 : 0 : n_group_desc = kvmalloc((gdb_num + 1) * sizeof(struct buffer_head *),
932 : : GFP_KERNEL);
933 [ # # ]: 0 : if (!n_group_desc) {
934 [ # # ]: 0 : brelse(gdb_bh);
935 : 0 : err = -ENOMEM;
936 : 0 : ext4_warning(sb, "not enough memory for %lu groups",
937 : : gdb_num + 1);
938 : 0 : return err;
939 : : }
940 : :
941 : 0 : rcu_read_lock();
942 : 0 : o_group_desc = rcu_dereference(EXT4_SB(sb)->s_group_desc);
943 : 0 : memcpy(n_group_desc, o_group_desc,
944 : 0 : EXT4_SB(sb)->s_gdb_count * sizeof(struct buffer_head *));
945 : 0 : rcu_read_unlock();
946 : 0 : n_group_desc[gdb_num] = gdb_bh;
947 : :
948 : 0 : BUFFER_TRACE(gdb_bh, "get_write_access");
949 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
950 [ # # ]: 0 : if (err) {
951 : 0 : kvfree(n_group_desc);
952 [ # # ]: 0 : brelse(gdb_bh);
953 : 0 : return err;
954 : : }
955 : :
956 : 0 : rcu_assign_pointer(EXT4_SB(sb)->s_group_desc, n_group_desc);
957 : 0 : EXT4_SB(sb)->s_gdb_count++;
958 : 0 : ext4_kvfree_array_rcu(o_group_desc);
959 : 0 : return err;
960 : : }
961 : :
962 : : /*
963 : : * Called when we are adding a new group which has a backup copy of each of
964 : : * the GDT blocks (i.e. sparse group) and there are reserved GDT blocks.
965 : : * We need to add these reserved backup GDT blocks to the resize inode, so
966 : : * that they are kept for future resizing and not allocated to files.
967 : : *
968 : : * Each reserved backup GDT block will go into a different indirect block.
969 : : * The indirect blocks are actually the primary reserved GDT blocks,
970 : : * so we know in advance what their block numbers are. We only get the
971 : : * double-indirect block to verify it is pointing to the primary reserved
972 : : * GDT blocks so we don't overwrite a data block by accident. The reserved
973 : : * backup GDT blocks are stored in their reserved primary GDT block.
974 : : */
975 : 0 : static int reserve_backup_gdb(handle_t *handle, struct inode *inode,
976 : : ext4_group_t group)
977 : : {
978 : 0 : struct super_block *sb = inode->i_sb;
979 : 0 : int reserved_gdb =le16_to_cpu(EXT4_SB(sb)->s_es->s_reserved_gdt_blocks);
980 : 0 : int cluster_bits = EXT4_SB(sb)->s_cluster_bits;
981 : 0 : struct buffer_head **primary;
982 : 0 : struct buffer_head *dind;
983 : 0 : struct ext4_iloc iloc;
984 : 0 : ext4_fsblk_t blk;
985 : 0 : __le32 *data, *end;
986 : 0 : int gdbackups = 0;
987 : 0 : int res, i;
988 : 0 : int err;
989 : :
990 : 0 : primary = kmalloc_array(reserved_gdb, sizeof(*primary), GFP_NOFS);
991 [ # # ]: 0 : if (!primary)
992 : : return -ENOMEM;
993 : :
994 : 0 : data = EXT4_I(inode)->i_data + EXT4_DIND_BLOCK;
995 : 0 : dind = ext4_sb_bread(sb, le32_to_cpu(*data), 0);
996 [ # # ]: 0 : if (IS_ERR(dind)) {
997 : 0 : err = PTR_ERR(dind);
998 : 0 : dind = NULL;
999 : 0 : goto exit_free;
1000 : : }
1001 : :
1002 : 0 : blk = EXT4_SB(sb)->s_sbh->b_blocknr + 1 + EXT4_SB(sb)->s_gdb_count;
1003 : 0 : data = (__le32 *)dind->b_data + (EXT4_SB(sb)->s_gdb_count %
1004 : 0 : EXT4_ADDR_PER_BLOCK(sb));
1005 : 0 : end = (__le32 *)dind->b_data + EXT4_ADDR_PER_BLOCK(sb);
1006 : :
1007 : : /* Get each reserved primary GDT block and verify it holds backups */
1008 [ # # ]: 0 : for (res = 0; res < reserved_gdb; res++, blk++) {
1009 [ # # ]: 0 : if (le32_to_cpu(*data) != blk) {
1010 : 0 : ext4_warning(sb, "reserved block %llu"
1011 : : " not at offset %ld",
1012 : : blk,
1013 : : (long)(data - (__le32 *)dind->b_data));
1014 : 0 : err = -EINVAL;
1015 : 0 : goto exit_bh;
1016 : : }
1017 : 0 : primary[res] = ext4_sb_bread(sb, blk, 0);
1018 [ # # ]: 0 : if (IS_ERR(primary[res])) {
1019 : 0 : err = PTR_ERR(primary[res]);
1020 : 0 : primary[res] = NULL;
1021 : 0 : goto exit_bh;
1022 : : }
1023 : 0 : gdbackups = verify_reserved_gdb(sb, group, primary[res]);
1024 [ # # ]: 0 : if (gdbackups < 0) {
1025 [ # # ]: 0 : brelse(primary[res]);
1026 : 0 : err = gdbackups;
1027 : 0 : goto exit_bh;
1028 : : }
1029 [ # # ]: 0 : if (++data >= end)
1030 : 0 : data = (__le32 *)dind->b_data;
1031 : : }
1032 : :
1033 [ # # ]: 0 : for (i = 0; i < reserved_gdb; i++) {
1034 : 0 : BUFFER_TRACE(primary[i], "get_write_access");
1035 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, primary[i])))
1036 : 0 : goto exit_bh;
1037 : : }
1038 : :
1039 [ # # ]: 0 : if ((err = ext4_reserve_inode_write(handle, inode, &iloc)))
1040 : 0 : goto exit_bh;
1041 : :
1042 : : /*
1043 : : * Finally we can add each of the reserved backup GDT blocks from
1044 : : * the new group to its reserved primary GDT block.
1045 : : */
1046 : 0 : blk = group * EXT4_BLOCKS_PER_GROUP(sb);
1047 [ # # ]: 0 : for (i = 0; i < reserved_gdb; i++) {
1048 : 0 : int err2;
1049 : 0 : data = (__le32 *)primary[i]->b_data;
1050 : : /* printk("reserving backup %lu[%u] = %lu\n",
1051 : : primary[i]->b_blocknr, gdbackups,
1052 : : blk + primary[i]->b_blocknr); */
1053 : 0 : data[gdbackups] = cpu_to_le32(blk + primary[i]->b_blocknr);
1054 : 0 : err2 = ext4_handle_dirty_metadata(handle, NULL, primary[i]);
1055 [ # # ]: 0 : if (!err)
1056 : 0 : err = err2;
1057 : : }
1058 : :
1059 : 0 : inode->i_blocks += reserved_gdb * sb->s_blocksize >> (9 - cluster_bits);
1060 : 0 : ext4_mark_iloc_dirty(handle, inode, &iloc);
1061 : :
1062 : 0 : exit_bh:
1063 [ # # ]: 0 : while (--res >= 0)
1064 [ # # ]: 0 : brelse(primary[res]);
1065 [ # # ]: 0 : brelse(dind);
1066 : :
1067 : 0 : exit_free:
1068 : 0 : kfree(primary);
1069 : :
1070 : 0 : return err;
1071 : : }
1072 : :
1073 : : /*
1074 : : * Update the backup copies of the ext4 metadata. These don't need to be part
1075 : : * of the main resize transaction, because e2fsck will re-write them if there
1076 : : * is a problem (basically only OOM will cause a problem). However, we
1077 : : * _should_ update the backups if possible, in case the primary gets trashed
1078 : : * for some reason and we need to run e2fsck from a backup superblock. The
1079 : : * important part is that the new block and inode counts are in the backup
1080 : : * superblocks, and the location of the new group metadata in the GDT backups.
1081 : : *
1082 : : * We do not need take the s_resize_lock for this, because these
1083 : : * blocks are not otherwise touched by the filesystem code when it is
1084 : : * mounted. We don't need to worry about last changing from
1085 : : * sbi->s_groups_count, because the worst that can happen is that we
1086 : : * do not copy the full number of backups at this time. The resize
1087 : : * which changed s_groups_count will backup again.
1088 : : */
1089 : 0 : static void update_backups(struct super_block *sb, sector_t blk_off, char *data,
1090 : : int size, int meta_bg)
1091 : : {
1092 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1093 : 0 : ext4_group_t last;
1094 : 0 : const int bpg = EXT4_BLOCKS_PER_GROUP(sb);
1095 : 0 : unsigned three = 1;
1096 : 0 : unsigned five = 5;
1097 : 0 : unsigned seven = 7;
1098 : 0 : ext4_group_t group = 0;
1099 : 0 : int rest = sb->s_blocksize - size;
1100 : 0 : handle_t *handle;
1101 : 0 : int err = 0, err2;
1102 : :
1103 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, EXT4_MAX_TRANS_DATA);
1104 [ # # ]: 0 : if (IS_ERR(handle)) {
1105 : 0 : group = 1;
1106 : 0 : err = PTR_ERR(handle);
1107 : 0 : goto exit_err;
1108 : : }
1109 : :
1110 [ # # ]: 0 : if (meta_bg == 0) {
1111 [ # # ]: 0 : group = ext4_list_backups(sb, &three, &five, &seven);
1112 : 0 : last = sbi->s_groups_count;
1113 : : } else {
1114 : 0 : group = ext4_get_group_number(sb, blk_off) + 1;
1115 : 0 : last = (ext4_group_t)(group + EXT4_DESC_PER_BLOCK(sb) - 2);
1116 : : }
1117 : :
1118 [ # # ]: 0 : while (group < sbi->s_groups_count) {
1119 : 0 : struct buffer_head *bh;
1120 : 0 : ext4_fsblk_t backup_block;
1121 : :
1122 : : /* Out of journal space, and can't get more - abort - so sad */
1123 : 0 : err = ext4_resize_ensure_credits_batch(handle, 1);
1124 [ # # ]: 0 : if (err < 0)
1125 : : break;
1126 : :
1127 [ # # ]: 0 : if (meta_bg == 0)
1128 : 0 : backup_block = ((ext4_fsblk_t)group) * bpg + blk_off;
1129 : : else
1130 : 0 : backup_block = (ext4_group_first_block_no(sb, group) +
1131 : 0 : ext4_bg_has_super(sb, group));
1132 : :
1133 : 0 : bh = sb_getblk(sb, backup_block);
1134 [ # # ]: 0 : if (unlikely(!bh)) {
1135 : : err = -ENOMEM;
1136 : : break;
1137 : : }
1138 : 0 : ext4_debug("update metadata backup %llu(+%llu)\n",
1139 : : backup_block, backup_block -
1140 : : ext4_group_first_block_no(sb, group));
1141 : 0 : BUFFER_TRACE(bh, "get_write_access");
1142 [ # # ]: 0 : if ((err = ext4_journal_get_write_access(handle, bh))) {
1143 [ # # ]: 0 : brelse(bh);
1144 : : break;
1145 : : }
1146 : 0 : lock_buffer(bh);
1147 : 0 : memcpy(bh->b_data, data, size);
1148 [ # # ]: 0 : if (rest)
1149 : 0 : memset(bh->b_data + size, 0, rest);
1150 : 0 : set_buffer_uptodate(bh);
1151 : 0 : unlock_buffer(bh);
1152 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, bh);
1153 [ # # ]: 0 : if (unlikely(err))
1154 [ # # ]: 0 : ext4_std_error(sb, err);
1155 [ # # ]: 0 : brelse(bh);
1156 : :
1157 [ # # ]: 0 : if (meta_bg == 0)
1158 [ # # ]: 0 : group = ext4_list_backups(sb, &three, &five, &seven);
1159 [ # # ]: 0 : else if (group == last)
1160 : : break;
1161 : : else
1162 : : group = last;
1163 : : }
1164 [ # # # # ]: 0 : if ((err2 = ext4_journal_stop(handle)) && !err)
1165 : 0 : err = err2;
1166 : :
1167 : : /*
1168 : : * Ugh! Need to have e2fsck write the backup copies. It is too
1169 : : * late to revert the resize, we shouldn't fail just because of
1170 : : * the backup copies (they are only needed in case of corruption).
1171 : : *
1172 : : * However, if we got here we have a journal problem too, so we
1173 : : * can't really start a transaction to mark the superblock.
1174 : : * Chicken out and just set the flag on the hope it will be written
1175 : : * to disk, and if not - we will simply wait until next fsck.
1176 : : */
1177 : 0 : exit_err:
1178 [ # # ]: 0 : if (err) {
1179 : 0 : ext4_warning(sb, "can't update backup for group %u (err %d), "
1180 : : "forcing fsck on next reboot", group, err);
1181 : 0 : sbi->s_mount_state &= ~EXT4_VALID_FS;
1182 : 0 : sbi->s_es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1183 : 0 : mark_buffer_dirty(sbi->s_sbh);
1184 : : }
1185 : 0 : }
1186 : :
1187 : : /*
1188 : : * ext4_add_new_descs() adds @count group descriptor of groups
1189 : : * starting at @group
1190 : : *
1191 : : * @handle: journal handle
1192 : : * @sb: super block
1193 : : * @group: the group no. of the first group desc to be added
1194 : : * @resize_inode: the resize inode
1195 : : * @count: number of group descriptors to be added
1196 : : */
1197 : 0 : static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
1198 : : ext4_group_t group, struct inode *resize_inode,
1199 : : ext4_group_t count)
1200 : : {
1201 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1202 : 0 : struct ext4_super_block *es = sbi->s_es;
1203 : 0 : struct buffer_head *gdb_bh;
1204 : 0 : int i, gdb_off, gdb_num, err = 0;
1205 : 0 : int meta_bg;
1206 : :
1207 : 0 : meta_bg = ext4_has_feature_meta_bg(sb);
1208 [ # # ]: 0 : for (i = 0; i < count; i++, group++) {
1209 : 0 : int reserved_gdb = ext4_bg_has_super(sb, group) ?
1210 [ # # ]: 0 : le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1211 : :
1212 [ # # ]: 0 : gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1213 : 0 : gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1214 : :
1215 : : /*
1216 : : * We will only either add reserved group blocks to a backup group
1217 : : * or remove reserved blocks for the first group in a new group block.
1218 : : * Doing both would be mean more complex code, and sane people don't
1219 : : * use non-sparse filesystems anymore. This is already checked above.
1220 : : */
1221 [ # # ]: 0 : if (gdb_off) {
1222 : 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc,
1223 : : gdb_num);
1224 : 0 : BUFFER_TRACE(gdb_bh, "get_write_access");
1225 : 0 : err = ext4_journal_get_write_access(handle, gdb_bh);
1226 : :
1227 [ # # # # ]: 0 : if (!err && reserved_gdb && ext4_bg_num_gdb(sb, group))
1228 : 0 : err = reserve_backup_gdb(handle, resize_inode, group);
1229 [ # # ]: 0 : } else if (meta_bg != 0) {
1230 : 0 : err = add_new_gdb_meta_bg(sb, handle, group);
1231 : : } else {
1232 : 0 : err = add_new_gdb(handle, resize_inode, group);
1233 : : }
1234 [ # # ]: 0 : if (err)
1235 : : break;
1236 : : }
1237 : 0 : return err;
1238 : : }
1239 : :
1240 : 0 : static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
1241 : : {
1242 : 0 : struct buffer_head *bh = sb_getblk(sb, block);
1243 [ # # ]: 0 : if (unlikely(!bh))
1244 : : return NULL;
1245 [ # # ]: 0 : if (!bh_uptodate_or_lock(bh)) {
1246 [ # # ]: 0 : if (bh_submit_read(bh) < 0) {
1247 [ # # ]: 0 : brelse(bh);
1248 : 0 : return NULL;
1249 : : }
1250 : : }
1251 : :
1252 : : return bh;
1253 : : }
1254 : :
1255 : : static int ext4_set_bitmap_checksums(struct super_block *sb,
1256 : : ext4_group_t group,
1257 : : struct ext4_group_desc *gdp,
1258 : : struct ext4_new_group_data *group_data)
1259 : : {
1260 : : struct buffer_head *bh;
1261 : :
1262 : : if (!ext4_has_metadata_csum(sb))
1263 : : return 0;
1264 : :
1265 : : bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
1266 : : if (!bh)
1267 : : return -EIO;
1268 : : ext4_inode_bitmap_csum_set(sb, group, gdp, bh,
1269 : : EXT4_INODES_PER_GROUP(sb) / 8);
1270 : : brelse(bh);
1271 : :
1272 : : bh = ext4_get_bitmap(sb, group_data->block_bitmap);
1273 : : if (!bh)
1274 : : return -EIO;
1275 : : ext4_block_bitmap_csum_set(sb, group, gdp, bh);
1276 : : brelse(bh);
1277 : :
1278 : : return 0;
1279 : : }
1280 : :
1281 : : /*
1282 : : * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg
1283 : : */
1284 : 0 : static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
1285 : : struct ext4_new_flex_group_data *flex_gd)
1286 : : {
1287 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1288 : 0 : struct ext4_group_desc *gdp;
1289 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1290 : 0 : struct buffer_head *gdb_bh;
1291 : 0 : ext4_group_t group;
1292 : 0 : __u16 *bg_flags = flex_gd->bg_flags;
1293 : 0 : int i, gdb_off, gdb_num, err = 0;
1294 : :
1295 : :
1296 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++, group_data++, bg_flags++) {
1297 : 0 : group = group_data->group;
1298 : :
1299 : 0 : gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
1300 : 0 : gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1301 : :
1302 : : /*
1303 : : * get_write_access() has been called on gdb_bh by ext4_add_new_desc().
1304 : : */
1305 : 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc, gdb_num);
1306 : : /* Update group descriptor block for new group */
1307 : 0 : gdp = (struct ext4_group_desc *)(gdb_bh->b_data +
1308 : 0 : gdb_off * EXT4_DESC_SIZE(sb));
1309 : :
1310 : 0 : memset(gdp, 0, EXT4_DESC_SIZE(sb));
1311 : 0 : ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
1312 : 0 : ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
1313 : 0 : err = ext4_set_bitmap_checksums(sb, group, gdp, group_data);
1314 [ # # ]: 0 : if (err) {
1315 : 0 : ext4_std_error(sb, err);
1316 : : break;
1317 : : }
1318 : :
1319 : 0 : ext4_inode_table_set(sb, gdp, group_data->inode_table);
1320 : 0 : ext4_free_group_clusters_set(sb, gdp,
1321 : : group_data->free_clusters_count);
1322 : 0 : ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
1323 [ # # ]: 0 : if (ext4_has_group_desc_csum(sb))
1324 : 0 : ext4_itable_unused_set(sb, gdp,
1325 : 0 : EXT4_INODES_PER_GROUP(sb));
1326 : 0 : gdp->bg_flags = cpu_to_le16(*bg_flags);
1327 : 0 : ext4_group_desc_csum_set(sb, group, gdp);
1328 : :
1329 : 0 : err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
1330 [ # # ]: 0 : if (unlikely(err)) {
1331 [ # # ]: 0 : ext4_std_error(sb, err);
1332 : : break;
1333 : : }
1334 : :
1335 : : /*
1336 : : * We can allocate memory for mb_alloc based on the new group
1337 : : * descriptor
1338 : : */
1339 : 0 : err = ext4_mb_add_groupinfo(sb, group, gdp);
1340 [ # # ]: 0 : if (err)
1341 : : break;
1342 : : }
1343 : 0 : return err;
1344 : : }
1345 : :
1346 : : /*
1347 : : * ext4_update_super() updates the super block so that the newly added
1348 : : * groups can be seen by the filesystem.
1349 : : *
1350 : : * @sb: super block
1351 : : * @flex_gd: new added groups
1352 : : */
1353 : : static void ext4_update_super(struct super_block *sb,
1354 : : struct ext4_new_flex_group_data *flex_gd)
1355 : : {
1356 : : ext4_fsblk_t blocks_count = 0;
1357 : : ext4_fsblk_t free_blocks = 0;
1358 : : ext4_fsblk_t reserved_blocks = 0;
1359 : : struct ext4_new_group_data *group_data = flex_gd->groups;
1360 : : struct ext4_sb_info *sbi = EXT4_SB(sb);
1361 : : struct ext4_super_block *es = sbi->s_es;
1362 : : int i;
1363 : :
1364 : : BUG_ON(flex_gd->count == 0 || group_data == NULL);
1365 : : /*
1366 : : * Make the new blocks and inodes valid next. We do this before
1367 : : * increasing the group count so that once the group is enabled,
1368 : : * all of its blocks and inodes are already valid.
1369 : : *
1370 : : * We always allocate group-by-group, then block-by-block or
1371 : : * inode-by-inode within a group, so enabling these
1372 : : * blocks/inodes before the group is live won't actually let us
1373 : : * allocate the new space yet.
1374 : : */
1375 : : for (i = 0; i < flex_gd->count; i++) {
1376 : : blocks_count += group_data[i].blocks_count;
1377 : : free_blocks += EXT4_C2B(sbi, group_data[i].free_clusters_count);
1378 : : }
1379 : :
1380 : : reserved_blocks = ext4_r_blocks_count(es) * 100;
1381 : : reserved_blocks = div64_u64(reserved_blocks, ext4_blocks_count(es));
1382 : : reserved_blocks *= blocks_count;
1383 : : do_div(reserved_blocks, 100);
1384 : :
1385 : : ext4_blocks_count_set(es, ext4_blocks_count(es) + blocks_count);
1386 : : ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + free_blocks);
1387 : : le32_add_cpu(&es->s_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1388 : : flex_gd->count);
1389 : : le32_add_cpu(&es->s_free_inodes_count, EXT4_INODES_PER_GROUP(sb) *
1390 : : flex_gd->count);
1391 : :
1392 : : ext4_debug("free blocks count %llu", ext4_free_blocks_count(es));
1393 : : /*
1394 : : * We need to protect s_groups_count against other CPUs seeing
1395 : : * inconsistent state in the superblock.
1396 : : *
1397 : : * The precise rules we use are:
1398 : : *
1399 : : * * Writers must perform a smp_wmb() after updating all
1400 : : * dependent data and before modifying the groups count
1401 : : *
1402 : : * * Readers must perform an smp_rmb() after reading the groups
1403 : : * count and before reading any dependent data.
1404 : : *
1405 : : * NB. These rules can be relaxed when checking the group count
1406 : : * while freeing data, as we can only allocate from a block
1407 : : * group after serialising against the group count, and we can
1408 : : * only then free after serialising in turn against that
1409 : : * allocation.
1410 : : */
1411 : : smp_wmb();
1412 : :
1413 : : /* Update the global fs size fields */
1414 : : sbi->s_groups_count += flex_gd->count;
1415 : : sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
1416 : : (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
1417 : :
1418 : : /* Update the reserved block counts only once the new group is
1419 : : * active. */
1420 : : ext4_r_blocks_count_set(es, ext4_r_blocks_count(es) +
1421 : : reserved_blocks);
1422 : :
1423 : : /* Update the free space counts */
1424 : : percpu_counter_add(&sbi->s_freeclusters_counter,
1425 : : EXT4_NUM_B2C(sbi, free_blocks));
1426 : : percpu_counter_add(&sbi->s_freeinodes_counter,
1427 : : EXT4_INODES_PER_GROUP(sb) * flex_gd->count);
1428 : :
1429 : : ext4_debug("free blocks count %llu",
1430 : : percpu_counter_read(&sbi->s_freeclusters_counter));
1431 : : if (ext4_has_feature_flex_bg(sb) && sbi->s_log_groups_per_flex) {
1432 : : ext4_group_t flex_group;
1433 : : struct flex_groups *fg;
1434 : :
1435 : : flex_group = ext4_flex_group(sbi, group_data[0].group);
1436 : : fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
1437 : : atomic64_add(EXT4_NUM_B2C(sbi, free_blocks),
1438 : : &fg->free_clusters);
1439 : : atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
1440 : : &fg->free_inodes);
1441 : : }
1442 : :
1443 : : /*
1444 : : * Update the fs overhead information
1445 : : */
1446 : : ext4_calculate_overhead(sb);
1447 : :
1448 : : if (test_opt(sb, DEBUG))
1449 : : printk(KERN_DEBUG "EXT4-fs: added group %u:"
1450 : : "%llu blocks(%llu free %llu reserved)\n", flex_gd->count,
1451 : : blocks_count, free_blocks, reserved_blocks);
1452 : : }
1453 : :
1454 : : /* Add a flex group to an fs. Ensure we handle all possible error conditions
1455 : : * _before_ we start modifying the filesystem, because we cannot abort the
1456 : : * transaction and not have it write the data to disk.
1457 : : */
1458 : 0 : static int ext4_flex_group_add(struct super_block *sb,
1459 : : struct inode *resize_inode,
1460 : : struct ext4_new_flex_group_data *flex_gd)
1461 : : {
1462 [ # # ]: 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1463 : 0 : struct ext4_super_block *es = sbi->s_es;
1464 : 0 : ext4_fsblk_t o_blocks_count;
1465 : 0 : ext4_grpblk_t last;
1466 : 0 : ext4_group_t group;
1467 : 0 : handle_t *handle;
1468 : 0 : unsigned reserved_gdb;
1469 : 0 : int err = 0, err2 = 0, credit;
1470 : :
1471 [ # # # # : 0 : BUG_ON(!flex_gd->count || !flex_gd->groups || !flex_gd->bg_flags);
# # ]
1472 : :
1473 : 0 : reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
1474 : 0 : o_blocks_count = ext4_blocks_count(es);
1475 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1476 [ # # ]: 0 : BUG_ON(last);
1477 : :
1478 : 0 : err = setup_new_flex_group_blocks(sb, flex_gd);
1479 [ # # ]: 0 : if (err)
1480 : 0 : goto exit;
1481 : : /*
1482 : : * We will always be modifying at least the superblock and GDT
1483 : : * blocks. If we are adding a group past the last current GDT block,
1484 : : * we will also modify the inode and the dindirect block. If we
1485 : : * are adding a group with superblock/GDT backups we will also
1486 : : * modify each of the reserved GDT dindirect blocks.
1487 : : */
1488 : 0 : credit = 3; /* sb, resize inode, resize inode dindirect */
1489 : : /* GDT blocks */
1490 : 0 : credit += 1 + DIV_ROUND_UP(flex_gd->count, EXT4_DESC_PER_BLOCK(sb));
1491 : 0 : credit += reserved_gdb; /* Reserved GDT dindirect blocks */
1492 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credit);
1493 [ # # ]: 0 : if (IS_ERR(handle)) {
1494 : 0 : err = PTR_ERR(handle);
1495 : 0 : goto exit;
1496 : : }
1497 : :
1498 : 0 : BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1499 : 0 : err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1500 [ # # ]: 0 : if (err)
1501 : 0 : goto exit_journal;
1502 : :
1503 : 0 : group = flex_gd->groups[0].group;
1504 [ # # ]: 0 : BUG_ON(group != sbi->s_groups_count);
1505 : 0 : err = ext4_add_new_descs(handle, sb, group,
1506 : : resize_inode, flex_gd->count);
1507 [ # # ]: 0 : if (err)
1508 : 0 : goto exit_journal;
1509 : :
1510 : 0 : err = ext4_setup_new_descs(handle, sb, flex_gd);
1511 [ # # ]: 0 : if (err)
1512 : 0 : goto exit_journal;
1513 : :
1514 : 0 : ext4_update_super(sb, flex_gd);
1515 : :
1516 : 0 : err = ext4_handle_dirty_super(handle, sb);
1517 : :
1518 : 0 : exit_journal:
1519 : 0 : err2 = ext4_journal_stop(handle);
1520 [ # # ]: 0 : if (!err)
1521 : 0 : err = err2;
1522 : :
1523 [ # # ]: 0 : if (!err) {
1524 : 0 : int gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
1525 : 0 : int gdb_num_end = ((group + flex_gd->count - 1) /
1526 : : EXT4_DESC_PER_BLOCK(sb));
1527 : 0 : int meta_bg = ext4_has_feature_meta_bg(sb);
1528 : 0 : sector_t old_gdb = 0;
1529 : :
1530 : 0 : update_backups(sb, sbi->s_sbh->b_blocknr, (char *)es,
1531 : : sizeof(struct ext4_super_block), 0);
1532 [ # # ]: 0 : for (; gdb_num <= gdb_num_end; gdb_num++) {
1533 : 0 : struct buffer_head *gdb_bh;
1534 : :
1535 : 0 : gdb_bh = sbi_array_rcu_deref(sbi, s_group_desc,
1536 : : gdb_num);
1537 [ # # ]: 0 : if (old_gdb == gdb_bh->b_blocknr)
1538 : 0 : continue;
1539 : 0 : update_backups(sb, gdb_bh->b_blocknr, gdb_bh->b_data,
1540 : 0 : gdb_bh->b_size, meta_bg);
1541 : 0 : old_gdb = gdb_bh->b_blocknr;
1542 : : }
1543 : : }
1544 : 0 : exit:
1545 : 0 : return err;
1546 : : }
1547 : :
1548 : 0 : static int ext4_setup_next_flex_gd(struct super_block *sb,
1549 : : struct ext4_new_flex_group_data *flex_gd,
1550 : : ext4_fsblk_t n_blocks_count,
1551 : : unsigned long flexbg_size)
1552 : : {
1553 [ # # ]: 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1554 : 0 : struct ext4_super_block *es = sbi->s_es;
1555 : 0 : struct ext4_new_group_data *group_data = flex_gd->groups;
1556 : 0 : ext4_fsblk_t o_blocks_count;
1557 : 0 : ext4_group_t n_group;
1558 : 0 : ext4_group_t group;
1559 : 0 : ext4_group_t last_group;
1560 : 0 : ext4_grpblk_t last;
1561 : 0 : ext4_grpblk_t clusters_per_group;
1562 : 0 : unsigned long i;
1563 : :
1564 : 0 : clusters_per_group = EXT4_CLUSTERS_PER_GROUP(sb);
1565 : :
1566 [ # # ]: 0 : o_blocks_count = ext4_blocks_count(es);
1567 : :
1568 [ # # ]: 0 : if (o_blocks_count == n_blocks_count)
1569 : : return 0;
1570 : :
1571 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1572 [ # # ]: 0 : BUG_ON(last);
1573 : 0 : ext4_get_group_no_and_offset(sb, n_blocks_count - 1, &n_group, &last);
1574 : :
1575 : 0 : last_group = group | (flexbg_size - 1);
1576 : 0 : if (last_group > n_group)
1577 : : last_group = n_group;
1578 : :
1579 : 0 : flex_gd->count = last_group - group + 1;
1580 : :
1581 [ # # ]: 0 : for (i = 0; i < flex_gd->count; i++) {
1582 : 0 : int overhead;
1583 : :
1584 : 0 : group_data[i].group = group + i;
1585 : 0 : group_data[i].blocks_count = EXT4_BLOCKS_PER_GROUP(sb);
1586 : 0 : overhead = ext4_group_overhead_blocks(sb, group + i);
1587 : 0 : group_data[i].mdata_blocks = overhead;
1588 : 0 : group_data[i].free_clusters_count = EXT4_CLUSTERS_PER_GROUP(sb);
1589 [ # # ]: 0 : if (ext4_has_group_desc_csum(sb)) {
1590 : 0 : flex_gd->bg_flags[i] = EXT4_BG_BLOCK_UNINIT |
1591 : : EXT4_BG_INODE_UNINIT;
1592 [ # # ]: 0 : if (!test_opt(sb, INIT_INODE_TABLE))
1593 : 0 : flex_gd->bg_flags[i] |= EXT4_BG_INODE_ZEROED;
1594 : : } else
1595 : 0 : flex_gd->bg_flags[i] = EXT4_BG_INODE_ZEROED;
1596 : : }
1597 : :
1598 [ # # # # ]: 0 : if (last_group == n_group && ext4_has_group_desc_csum(sb))
1599 : : /* We need to initialize block bitmap of last group. */
1600 : 0 : flex_gd->bg_flags[i - 1] &= ~EXT4_BG_BLOCK_UNINIT;
1601 : :
1602 [ # # # # ]: 0 : if ((last_group == n_group) && (last != clusters_per_group - 1)) {
1603 : 0 : group_data[i - 1].blocks_count = EXT4_C2B(sbi, last + 1);
1604 : 0 : group_data[i - 1].free_clusters_count -= clusters_per_group -
1605 : : last - 1;
1606 : : }
1607 : :
1608 : : return 1;
1609 : : }
1610 : :
1611 : : /* Add group descriptor data to an existing or new group descriptor block.
1612 : : * Ensure we handle all possible error conditions _before_ we start modifying
1613 : : * the filesystem, because we cannot abort the transaction and not have it
1614 : : * write the data to disk.
1615 : : *
1616 : : * If we are on a GDT block boundary, we need to get the reserved GDT block.
1617 : : * Otherwise, we may need to add backup GDT blocks for a sparse group.
1618 : : *
1619 : : * We only need to hold the superblock lock while we are actually adding
1620 : : * in the new group's counts to the superblock. Prior to that we have
1621 : : * not really "added" the group at all. We re-check that we are still
1622 : : * adding in the last group in case things have changed since verifying.
1623 : : */
1624 : 0 : int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
1625 : : {
1626 : 0 : struct ext4_new_flex_group_data flex_gd;
1627 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1628 : 0 : struct ext4_super_block *es = sbi->s_es;
1629 : 0 : int reserved_gdb = ext4_bg_has_super(sb, input->group) ?
1630 [ # # ]: 0 : le16_to_cpu(es->s_reserved_gdt_blocks) : 0;
1631 : 0 : struct inode *inode = NULL;
1632 : 0 : int gdb_off;
1633 : 0 : int err;
1634 : 0 : __u16 bg_flags = 0;
1635 : :
1636 [ # # ]: 0 : gdb_off = input->group % EXT4_DESC_PER_BLOCK(sb);
1637 : :
1638 [ # # # # ]: 0 : if (gdb_off == 0 && !ext4_has_feature_sparse_super(sb)) {
1639 : 0 : ext4_warning(sb, "Can't resize non-sparse filesystem further");
1640 : 0 : return -EPERM;
1641 : : }
1642 : :
1643 [ # # ]: 0 : if (ext4_blocks_count(es) + input->blocks_count <
1644 : : ext4_blocks_count(es)) {
1645 : 0 : ext4_warning(sb, "blocks_count overflow");
1646 : 0 : return -EINVAL;
1647 : : }
1648 : :
1649 [ # # ]: 0 : if (le32_to_cpu(es->s_inodes_count) + EXT4_INODES_PER_GROUP(sb) <
1650 : : le32_to_cpu(es->s_inodes_count)) {
1651 : 0 : ext4_warning(sb, "inodes_count overflow");
1652 : 0 : return -EINVAL;
1653 : : }
1654 : :
1655 [ # # ]: 0 : if (reserved_gdb || gdb_off == 0) {
1656 [ # # ]: 0 : if (!ext4_has_feature_resize_inode(sb) ||
1657 [ # # ]: 0 : !le16_to_cpu(es->s_reserved_gdt_blocks)) {
1658 : 0 : ext4_warning(sb,
1659 : : "No reserved GDT blocks, can't resize");
1660 : 0 : return -EPERM;
1661 : : }
1662 : 0 : inode = ext4_iget(sb, EXT4_RESIZE_INO, EXT4_IGET_SPECIAL);
1663 [ # # ]: 0 : if (IS_ERR(inode)) {
1664 : 0 : ext4_warning(sb, "Error opening resize inode");
1665 : 0 : return PTR_ERR(inode);
1666 : : }
1667 : : }
1668 : :
1669 : :
1670 : 0 : err = verify_group_input(sb, input);
1671 [ # # ]: 0 : if (err)
1672 : 0 : goto out;
1673 : :
1674 : 0 : err = ext4_alloc_flex_bg_array(sb, input->group + 1);
1675 [ # # ]: 0 : if (err)
1676 : 0 : goto out;
1677 : :
1678 : 0 : err = ext4_mb_alloc_groupinfo(sb, input->group + 1);
1679 [ # # ]: 0 : if (err)
1680 : 0 : goto out;
1681 : :
1682 : 0 : flex_gd.count = 1;
1683 : 0 : flex_gd.groups = input;
1684 : 0 : flex_gd.bg_flags = &bg_flags;
1685 : 0 : err = ext4_flex_group_add(sb, inode, &flex_gd);
1686 : 0 : out:
1687 : 0 : iput(inode);
1688 : 0 : return err;
1689 : : } /* ext4_group_add */
1690 : :
1691 : : /*
1692 : : * extend a group without checking assuming that checking has been done.
1693 : : */
1694 : 0 : static int ext4_group_extend_no_check(struct super_block *sb,
1695 : : ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)
1696 : : {
1697 : 0 : struct ext4_super_block *es = EXT4_SB(sb)->s_es;
1698 : 0 : handle_t *handle;
1699 : 0 : int err = 0, err2;
1700 : :
1701 : : /* We will update the superblock, one block bitmap, and
1702 : : * one group descriptor via ext4_group_add_blocks().
1703 : : */
1704 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, 3);
1705 [ # # ]: 0 : if (IS_ERR(handle)) {
1706 : 0 : err = PTR_ERR(handle);
1707 : 0 : ext4_warning(sb, "error %d on journal start", err);
1708 : 0 : return err;
1709 : : }
1710 : :
1711 : 0 : BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "get_write_access");
1712 : 0 : err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);
1713 [ # # ]: 0 : if (err) {
1714 : 0 : ext4_warning(sb, "error %d on journal write access", err);
1715 : 0 : goto errout;
1716 : : }
1717 : :
1718 : 0 : ext4_blocks_count_set(es, o_blocks_count + add);
1719 : 0 : ext4_free_blocks_count_set(es, ext4_free_blocks_count(es) + add);
1720 : 0 : ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,
1721 : : o_blocks_count + add);
1722 : : /* We add the blocks to the bitmap and set the group need init bit */
1723 : 0 : err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);
1724 [ # # ]: 0 : if (err)
1725 : 0 : goto errout;
1726 : 0 : ext4_handle_dirty_super(handle, sb);
1727 : 0 : ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,
1728 : : o_blocks_count + add);
1729 : 0 : errout:
1730 : 0 : err2 = ext4_journal_stop(handle);
1731 [ # # ]: 0 : if (err2 && !err)
1732 : 0 : err = err2;
1733 : :
1734 [ # # ]: 0 : if (!err) {
1735 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1736 : 0 : printk(KERN_DEBUG "EXT4-fs: extended group to %llu "
1737 : : "blocks\n", ext4_blocks_count(es));
1738 : 0 : update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr,
1739 : : (char *)es, sizeof(struct ext4_super_block), 0);
1740 : : }
1741 : : return err;
1742 : : }
1743 : :
1744 : : /*
1745 : : * Extend the filesystem to the new number of blocks specified. This entry
1746 : : * point is only used to extend the current filesystem to the end of the last
1747 : : * existing group. It can be accessed via ioctl, or by "remount,resize=<size>"
1748 : : * for emergencies (because it has no dependencies on reserved blocks).
1749 : : *
1750 : : * If we _really_ wanted, we could use default values to call ext4_group_add()
1751 : : * allow the "remount" trick to work for arbitrary resizing, assuming enough
1752 : : * GDT blocks are reserved to grow to the desired size.
1753 : : */
1754 : 0 : int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
1755 : : ext4_fsblk_t n_blocks_count)
1756 : : {
1757 : 0 : ext4_fsblk_t o_blocks_count;
1758 : 0 : ext4_grpblk_t last;
1759 : 0 : ext4_grpblk_t add;
1760 : 0 : struct buffer_head *bh;
1761 : 0 : int err;
1762 : 0 : ext4_group_t group;
1763 : :
1764 [ # # ]: 0 : o_blocks_count = ext4_blocks_count(es);
1765 : :
1766 [ # # ]: 0 : if (test_opt(sb, DEBUG))
1767 : 0 : ext4_msg(sb, KERN_DEBUG,
1768 : : "extending last group from %llu to %llu blocks",
1769 : : o_blocks_count, n_blocks_count);
1770 : :
1771 [ # # ]: 0 : if (n_blocks_count == 0 || n_blocks_count == o_blocks_count)
1772 : : return 0;
1773 : :
1774 [ # # ]: 0 : if (n_blocks_count > (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1775 : 0 : ext4_msg(sb, KERN_ERR,
1776 : : "filesystem too large to resize to %llu blocks safely",
1777 : : n_blocks_count);
1778 : 0 : return -EINVAL;
1779 : : }
1780 : :
1781 [ # # ]: 0 : if (n_blocks_count < o_blocks_count) {
1782 : 0 : ext4_warning(sb, "can't shrink FS - resize aborted");
1783 : 0 : return -EINVAL;
1784 : : }
1785 : :
1786 : : /* Handle the remaining blocks in the last group only. */
1787 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
1788 : :
1789 [ # # ]: 0 : if (last == 0) {
1790 : 0 : ext4_warning(sb, "need to use ext2online to resize further");
1791 : 0 : return -EPERM;
1792 : : }
1793 : :
1794 [ # # ]: 0 : add = EXT4_BLOCKS_PER_GROUP(sb) - last;
1795 : :
1796 [ # # ]: 0 : if (o_blocks_count + add < o_blocks_count) {
1797 : 0 : ext4_warning(sb, "blocks_count overflow");
1798 : 0 : return -EINVAL;
1799 : : }
1800 : :
1801 [ # # ]: 0 : if (o_blocks_count + add > n_blocks_count)
1802 : 0 : add = n_blocks_count - o_blocks_count;
1803 : :
1804 [ # # ]: 0 : if (o_blocks_count + add < n_blocks_count)
1805 : 0 : ext4_warning(sb, "will only finish group (%llu blocks, %u new)",
1806 : : o_blocks_count + add, add);
1807 : :
1808 : : /* See if the device is actually as big as what was requested */
1809 : 0 : bh = sb_bread(sb, o_blocks_count + add - 1);
1810 [ # # ]: 0 : if (!bh) {
1811 : 0 : ext4_warning(sb, "can't read last block, resize aborted");
1812 : 0 : return -ENOSPC;
1813 : : }
1814 : 0 : brelse(bh);
1815 : :
1816 : 0 : err = ext4_group_extend_no_check(sb, o_blocks_count, add);
1817 : 0 : return err;
1818 : : } /* ext4_group_extend */
1819 : :
1820 : :
1821 : 0 : static int num_desc_blocks(struct super_block *sb, ext4_group_t groups)
1822 : : {
1823 : 0 : return (groups + EXT4_DESC_PER_BLOCK(sb) - 1) / EXT4_DESC_PER_BLOCK(sb);
1824 : : }
1825 : :
1826 : : /*
1827 : : * Release the resize inode and drop the resize_inode feature if there
1828 : : * are no more reserved gdt blocks, and then convert the file system
1829 : : * to enable meta_bg
1830 : : */
1831 : 0 : static int ext4_convert_meta_bg(struct super_block *sb, struct inode *inode)
1832 : : {
1833 : 0 : handle_t *handle;
1834 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1835 : 0 : struct ext4_super_block *es = sbi->s_es;
1836 : 0 : struct ext4_inode_info *ei = EXT4_I(inode);
1837 : 0 : ext4_fsblk_t nr;
1838 : 0 : int i, ret, err = 0;
1839 : 0 : int credits = 1;
1840 : :
1841 : 0 : ext4_msg(sb, KERN_INFO, "Converting file system to meta_bg");
1842 [ # # ]: 0 : if (inode) {
1843 [ # # ]: 0 : if (es->s_reserved_gdt_blocks) {
1844 : 0 : ext4_error(sb, "Unexpected non-zero "
1845 : : "s_reserved_gdt_blocks");
1846 : 0 : return -EPERM;
1847 : : }
1848 : :
1849 : : /* Do a quick sanity check of the resize inode */
1850 : 0 : if (inode->i_blocks != 1 << (inode->i_blkbits -
1851 [ # # ]: 0 : (9 - sbi->s_cluster_bits)))
1852 : 0 : goto invalid_resize_inode;
1853 [ # # ]: 0 : for (i = 0; i < EXT4_N_BLOCKS; i++) {
1854 [ # # ]: 0 : if (i == EXT4_DIND_BLOCK) {
1855 [ # # ]: 0 : if (ei->i_data[i])
1856 : 0 : continue;
1857 : : else
1858 : 0 : goto invalid_resize_inode;
1859 : : }
1860 [ # # ]: 0 : if (ei->i_data[i])
1861 : 0 : goto invalid_resize_inode;
1862 : : }
1863 : : credits += 3; /* block bitmap, bg descriptor, resize inode */
1864 : : }
1865 : :
1866 : 0 : handle = ext4_journal_start_sb(sb, EXT4_HT_RESIZE, credits);
1867 [ # # ]: 0 : if (IS_ERR(handle))
1868 : 0 : return PTR_ERR(handle);
1869 : :
1870 : 0 : BUFFER_TRACE(sbi->s_sbh, "get_write_access");
1871 : 0 : err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1872 [ # # ]: 0 : if (err)
1873 : 0 : goto errout;
1874 : :
1875 : 0 : ext4_clear_feature_resize_inode(sb);
1876 : 0 : ext4_set_feature_meta_bg(sb);
1877 : 0 : sbi->s_es->s_first_meta_bg =
1878 : 0 : cpu_to_le32(num_desc_blocks(sb, sbi->s_groups_count));
1879 : :
1880 : 0 : err = ext4_handle_dirty_super(handle, sb);
1881 [ # # ]: 0 : if (err) {
1882 : 0 : ext4_std_error(sb, err);
1883 : 0 : goto errout;
1884 : : }
1885 : :
1886 [ # # ]: 0 : if (inode) {
1887 : 0 : nr = le32_to_cpu(ei->i_data[EXT4_DIND_BLOCK]);
1888 : 0 : ext4_free_blocks(handle, inode, NULL, nr, 1,
1889 : : EXT4_FREE_BLOCKS_METADATA |
1890 : : EXT4_FREE_BLOCKS_FORGET);
1891 : 0 : ei->i_data[EXT4_DIND_BLOCK] = 0;
1892 : 0 : inode->i_blocks = 0;
1893 : :
1894 : 0 : err = ext4_mark_inode_dirty(handle, inode);
1895 [ # # ]: 0 : if (err)
1896 : 0 : ext4_std_error(sb, err);
1897 : : }
1898 : :
1899 : 0 : errout:
1900 : 0 : ret = ext4_journal_stop(handle);
1901 : 0 : if (!err)
1902 : : err = ret;
1903 : : return ret;
1904 : :
1905 : 0 : invalid_resize_inode:
1906 : 0 : ext4_error(sb, "corrupted/inconsistent resize inode");
1907 : 0 : return -EINVAL;
1908 : : }
1909 : :
1910 : : /*
1911 : : * ext4_resize_fs() resizes a fs to new size specified by @n_blocks_count
1912 : : *
1913 : : * @sb: super block of the fs to be resized
1914 : : * @n_blocks_count: the number of blocks resides in the resized fs
1915 : : */
1916 : 0 : int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count)
1917 : : {
1918 : 0 : struct ext4_new_flex_group_data *flex_gd = NULL;
1919 : 0 : struct ext4_sb_info *sbi = EXT4_SB(sb);
1920 : 0 : struct ext4_super_block *es = sbi->s_es;
1921 : 0 : struct buffer_head *bh;
1922 : 0 : struct inode *resize_inode = NULL;
1923 : 0 : ext4_grpblk_t add, offset;
1924 : 0 : unsigned long n_desc_blocks;
1925 : 0 : unsigned long o_desc_blocks;
1926 : 0 : ext4_group_t o_group;
1927 : 0 : ext4_group_t n_group;
1928 : 0 : ext4_fsblk_t o_blocks_count;
1929 : 0 : ext4_fsblk_t n_blocks_count_retry = 0;
1930 : 0 : unsigned long last_update_time = 0;
1931 : 0 : int err = 0, flexbg_size = 1 << sbi->s_log_groups_per_flex;
1932 : 0 : int meta_bg;
1933 : :
1934 : : /* See if the device is actually as big as what was requested */
1935 : 0 : bh = sb_bread(sb, n_blocks_count - 1);
1936 [ # # ]: 0 : if (!bh) {
1937 : 0 : ext4_warning(sb, "can't read last block, resize aborted");
1938 : 0 : return -ENOSPC;
1939 : : }
1940 : 0 : brelse(bh);
1941 : :
1942 : : retry:
1943 : 0 : o_blocks_count = ext4_blocks_count(es);
1944 : :
1945 : 0 : ext4_msg(sb, KERN_INFO, "resizing filesystem from %llu "
1946 : : "to %llu blocks", o_blocks_count, n_blocks_count);
1947 : :
1948 [ # # ]: 0 : if (n_blocks_count < o_blocks_count) {
1949 : : /* On-line shrinking not supported */
1950 : 0 : ext4_warning(sb, "can't shrink FS - resize aborted");
1951 : 0 : return -EINVAL;
1952 : : }
1953 : :
1954 [ # # ]: 0 : if (n_blocks_count == o_blocks_count)
1955 : : /* Nothing need to do */
1956 : : return 0;
1957 : :
1958 : 0 : n_group = ext4_get_group_number(sb, n_blocks_count - 1);
1959 [ # # ]: 0 : if (n_group >= (0xFFFFFFFFUL / EXT4_INODES_PER_GROUP(sb))) {
1960 : 0 : ext4_warning(sb, "resize would cause inodes_count overflow");
1961 : 0 : return -EINVAL;
1962 : : }
1963 : 0 : ext4_get_group_no_and_offset(sb, o_blocks_count - 1, &o_group, &offset);
1964 : :
1965 [ # # ]: 0 : n_desc_blocks = num_desc_blocks(sb, n_group + 1);
1966 : 0 : o_desc_blocks = num_desc_blocks(sb, sbi->s_groups_count);
1967 : :
1968 [ # # ]: 0 : meta_bg = ext4_has_feature_meta_bg(sb);
1969 : :
1970 [ # # ]: 0 : if (ext4_has_feature_resize_inode(sb)) {
1971 [ # # ]: 0 : if (meta_bg) {
1972 : 0 : ext4_error(sb, "resize_inode and meta_bg enabled "
1973 : : "simultaneously");
1974 : 0 : return -EINVAL;
1975 : : }
1976 : 0 : if (n_desc_blocks > o_desc_blocks +
1977 [ # # ]: 0 : le16_to_cpu(es->s_reserved_gdt_blocks)) {
1978 : 0 : n_blocks_count_retry = n_blocks_count;
1979 : 0 : n_desc_blocks = o_desc_blocks +
1980 : : le16_to_cpu(es->s_reserved_gdt_blocks);
1981 : 0 : n_group = n_desc_blocks * EXT4_DESC_PER_BLOCK(sb);
1982 : 0 : n_blocks_count = (ext4_fsblk_t)n_group *
1983 : 0 : EXT4_BLOCKS_PER_GROUP(sb) +
1984 : 0 : le32_to_cpu(es->s_first_data_block);
1985 : 0 : n_group--; /* set to last group number */
1986 : : }
1987 : :
1988 [ # # ]: 0 : if (!resize_inode)
1989 : 0 : resize_inode = ext4_iget(sb, EXT4_RESIZE_INO,
1990 : : EXT4_IGET_SPECIAL);
1991 [ # # ]: 0 : if (IS_ERR(resize_inode)) {
1992 : 0 : ext4_warning(sb, "Error opening resize inode");
1993 : 0 : return PTR_ERR(resize_inode);
1994 : : }
1995 : : }
1996 : :
1997 [ # # # # ]: 0 : if ((!resize_inode && !meta_bg) || n_blocks_count == o_blocks_count) {
1998 : 0 : err = ext4_convert_meta_bg(sb, resize_inode);
1999 [ # # ]: 0 : if (err)
2000 : 0 : goto out;
2001 [ # # ]: 0 : if (resize_inode) {
2002 : 0 : iput(resize_inode);
2003 : 0 : resize_inode = NULL;
2004 : : }
2005 [ # # ]: 0 : if (n_blocks_count_retry) {
2006 : 0 : n_blocks_count = n_blocks_count_retry;
2007 : 0 : n_blocks_count_retry = 0;
2008 : 0 : goto retry;
2009 : : }
2010 : : }
2011 : :
2012 : : /*
2013 : : * Make sure the last group has enough space so that it's
2014 : : * guaranteed to have enough space for all metadata blocks
2015 : : * that it might need to hold. (We might not need to store
2016 : : * the inode table blocks in the last block group, but there
2017 : : * will be cases where this might be needed.)
2018 : : */
2019 : 0 : if ((ext4_group_first_block_no(sb, n_group) +
2020 : 0 : ext4_group_overhead_blocks(sb, n_group) + 2 +
2021 [ # # ]: 0 : sbi->s_itb_per_group + sbi->s_cluster_ratio) >= n_blocks_count) {
2022 [ # # ]: 0 : n_blocks_count = ext4_group_first_block_no(sb, n_group);
2023 : 0 : n_group--;
2024 : 0 : n_blocks_count_retry = 0;
2025 [ # # ]: 0 : if (resize_inode) {
2026 : 0 : iput(resize_inode);
2027 : 0 : resize_inode = NULL;
2028 : : }
2029 : 0 : goto retry;
2030 : : }
2031 : :
2032 : : /* extend the last group */
2033 [ # # ]: 0 : if (n_group == o_group)
2034 : 0 : add = n_blocks_count - o_blocks_count;
2035 : : else
2036 : 0 : add = EXT4_C2B(sbi, EXT4_CLUSTERS_PER_GROUP(sb) - (offset + 1));
2037 [ # # ]: 0 : if (add > 0) {
2038 : 0 : err = ext4_group_extend_no_check(sb, o_blocks_count, add);
2039 [ # # ]: 0 : if (err)
2040 : 0 : goto out;
2041 : : }
2042 : :
2043 [ # # ]: 0 : if (ext4_blocks_count(es) == n_blocks_count)
2044 : 0 : goto out;
2045 : :
2046 : 0 : err = ext4_alloc_flex_bg_array(sb, n_group + 1);
2047 [ # # ]: 0 : if (err)
2048 : 0 : goto out;
2049 : :
2050 : 0 : err = ext4_mb_alloc_groupinfo(sb, n_group + 1);
2051 [ # # ]: 0 : if (err)
2052 : 0 : goto out;
2053 : :
2054 : 0 : flex_gd = alloc_flex_gd(flexbg_size);
2055 [ # # ]: 0 : if (flex_gd == NULL) {
2056 : 0 : err = -ENOMEM;
2057 : 0 : goto out;
2058 : : }
2059 : :
2060 : : /* Add flex groups. Note that a regular group is a
2061 : : * flex group with 1 group.
2062 : : */
2063 [ # # ]: 0 : while (ext4_setup_next_flex_gd(sb, flex_gd, n_blocks_count,
2064 : : flexbg_size)) {
2065 [ # # ]: 0 : if (jiffies - last_update_time > HZ * 10) {
2066 [ # # ]: 0 : if (last_update_time)
2067 : 0 : ext4_msg(sb, KERN_INFO,
2068 : : "resized to %llu blocks",
2069 : : ext4_blocks_count(es));
2070 : 0 : last_update_time = jiffies;
2071 : : }
2072 [ # # ]: 0 : if (ext4_alloc_group_tables(sb, flex_gd, flexbg_size) != 0)
2073 : : break;
2074 : 0 : err = ext4_flex_group_add(sb, resize_inode, flex_gd);
2075 [ # # ]: 0 : if (unlikely(err))
2076 : : break;
2077 : : }
2078 : :
2079 [ # # ]: 0 : if (!err && n_blocks_count_retry) {
2080 : 0 : n_blocks_count = n_blocks_count_retry;
2081 : 0 : n_blocks_count_retry = 0;
2082 : 0 : free_flex_gd(flex_gd);
2083 : 0 : flex_gd = NULL;
2084 [ # # ]: 0 : if (resize_inode) {
2085 : 0 : iput(resize_inode);
2086 : 0 : resize_inode = NULL;
2087 : : }
2088 : 0 : goto retry;
2089 : : }
2090 : :
2091 : 0 : out:
2092 [ # # ]: 0 : if (flex_gd)
2093 : 0 : free_flex_gd(flex_gd);
2094 [ # # ]: 0 : if (resize_inode != NULL)
2095 : 0 : iput(resize_inode);
2096 [ # # ]: 0 : if (err)
2097 : 0 : ext4_warning(sb, "error (%d) occurred during "
2098 : : "file system resize", err);
2099 : 0 : ext4_msg(sb, KERN_INFO, "resized filesystem to %llu",
2100 : : ext4_blocks_count(es));
2101 : 0 : return err;
2102 : : }
|
